D'VersiBIT« 1/4" x 36" Extension. Quickly and easily switch from drilling to pulling with the quick change pulling grip. No more fiddling with hooking a pulling grip to the bit. Lower Cost of Ownership: Replace only the bit as it wears rather then the entire bit and shaft for lower overall cost of ownership. Convenience: Create the right length for the job-18" or 36" sections for different size combinations. Use with any type of bit with a +" quick change hex such as spade bits or auger bits, drill bits for increased application flexibility. Easier to store-breaksdown to fit into most tool bags and storage boxes. More flexibility and versatility along with all the same great features as a traditional flexible drill bit. All the same great features as a traditional flexible drill bit, but with even more flexibility and versatility. Simplifies the frustrating and time-consuming process ofinstalling wire or cable inside existing walls. For use when drilling between studs and joists.